Is my doctor over exaggerating about my weight loss?

Back in highschool I did struggle with a eating disorder but when I was 21 I did gain a lot of weight all in my early 20's. Now I am age 29 I went from 168 to 120 this year and the doctor seems worried which I feel great. I do work out I don't skip meals. Is my doctor exaggerating?
Is my doctor over exaggerating about my weight loss?
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